WEBMay 15, 2015 · The leaching process with dilute HNO 3 was performed at pilot scale and optimized for the extraction of scandium from bauxite residue (OchsenkühnPetropoulou et al., 2002). Xue et al. (2010) found that at a reaction temperature of 90 °C and an L/S ratio of 3:1, over 80% of the scandium in bauxite residue could be leached by H 2 SO 4 .
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WEBJul 15, 2019 · In this study, an alternative twostage extraction process to acid roastingwater leaching was investigated to recover scandium from a Canadian bauxite residue. The process is called acid bakingwater leaching, in which bauxite residue is mixed with 98 wt% H 2 SO 4, baked in a furnace at 200–400 °C, and leached in water at ambient .
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WEBFeb 16, 2019 · The Bayer process is the main process applied to obtain alumina from bauxite ore. The mineral is dissolved using sodium hydroxide in digesters, which obtain sodium aluminate in solution and a solid phase called red mud; the two are separated by the clarifiion process [1, 2].Brazil is the third country in bauxite reserves in the world, .
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WEBJan 1, 2022 · The process combines carbothermic smelting, acid baking – water leaching, and thermal desulfation to efficiently extract the target materials from the bauxite residue without producing hazardous solid residues, while enabling the recovery and recycling of the major process reagents: CaO, SiO 2, and H 2 SO 4. Through .
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WEBThe leaching order of these materials are as follows: Goethite > serpentine > magnetite and hematite. The leaching kinetics were analyzed and this leaching process followed a shrinking core model controlled by a combination of .
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WEBJan 1, 2016 · PDF | On August 3, 1888 German Patent No. 43977 entitled "A Process for the Production of Aluminum Hydroxide" was issued**. ... The Bayer Process involved the pressure leaching of bauxite with ...
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WEBNov 18, 2016 · Bauxite residue (red mud) with a high alumina content requires large amounts of fluxes during smelting, which increases the overall process cost, the energy consumption during smelting, and the acid consumption during slag leaching and decreases the throughput of bauxite residue in the smelting phase. Therefore, alumina .
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WEBDec 8, 2009 · A kind of composite brick made from the Bayer process bauxite residue was produced depending on the combined solidifying performance of cement and limefly ash ... The first leaching process was completed using 6 mol/L HCl solution with the leaching rate of Sc 2 O 3 being over 80% and the leaching rate of TiO 2 at approximately 1%.
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WEBJan 1, 2023 · The extracted Al in these studies exceeded 80%. However, the kinetics of the leaching process and the behavior of the major and trace elements have not been examined. Therefore, the leaching of highsilica bauxite from the Severoonezhsk deposit (μ Si < 3) using a mixture of NH 4 HSO 4 and H 2 SO 4 was investigated for the first .
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WEBJan 1, 2010 · The proposed ANN method could be applied as a new method for the prediction of leaching recovery in the Bayer process, when the bauxite from different sources and with different chemical ...
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WEBFeb 16, 2019 · The process of leaching using fungalproduced organic acids as a leaching solution results in removal of 80% of total iron from bauxite . Papassiopi et al. [ 64 ] investigated the combined effect of ethylenediamine tetracetic acid (EDTA) and metabolism of Desulfuromonas palmitatis in removing iron oxides from the bauxite .
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WEBJun 1, 2016 · Leaching efficiency depends on the bauxite residue composition and process parameters, such as reagent type and concentration, retention time, temperature, and solid/liquid ratio [2,3,5,6,9,10]. ...
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WEBApr 4, 2018 · Due to drawbacks of the direct leaching route from bauxite residue, such as silica gel formation and low selectivity towards these valuable metals, a novel leaching process based on oxidative ...
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WEBThe Bayer process is the most commonly used refinement route, though certain countries use alternatives called the combined or parallel BayerSinter process and the Nephelinebased process [20, 37].This section describes purely the Bayer Process. Due to the impurities in the bauxite ore, it requires treatment to produce purer alumina, Al 2 O 3 .
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WEBAug 11, 2016 · Therefore, the leaching process with dilute HNO 3 has been performed and optimized at a pilot scale for the recovery of scandium from bauxite residue . According to Petrakova et al., leaching with nitric acid could be a problem due to the absorption of nitrate ions on the residue, so that large volumes of water are needed for their removal [ .
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WEBNov 1, 2023 · For complete valorization of bauxite residue, iron content needs to be lowered by recovering it through smelting reduction followed by slag leaching for the recovery of other metals (, Ti and REEs). Smelting reduction process becomes uneconomical with high alumina as it hinders efficient separation of metal and slag .
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WEBDec 27, 2021 · The carbonate leaching of scandium from the landfilled bauxite residue (red mud) of the Bogoslovsky Aluminum Plant (Russia) and samples of red mud (RM) after alkaline pretreatment has been ...
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WEBJan 6, 2022 · In order to clarify these open questions, leaching tests on bauxite were planned and evaluated in this study using the computerized statistical design of experiments method. ... With an acid leaching process using hydrochloric acid, ironrich bauxite can be beneficiated to achieve an Fe 2 O 3 content < 2 %, ...
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WEBFeb 1, 2020 · Bauxite residue, a byproduct of alumina manufacture, is a serious environmental pollutant due to its high leaching contents of metals and caustic compounds.
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WEBJul 15, 2019 · The current study put the emphasis on developing a novel and environmentally friendly waste valorization process, called "acidbaking waterleaching", to recover scandium from bauxite residue produced by the aluminum industry. In this process, bauxite residue is mixed with concentrated sulfuric acid, baked in a furnace at .
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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